
1.AXIS CONTROL B-63323EN-1/03
- 90 -
- When ‘Smooth backlash compensation’ is required
Usually, relationship between motor position and actual machine
position can be shown as Fig.1.3.11(c). In this case, conventional
backlash compensation (compensation pulse is outputted at once when
direction changes) is enough to overcome this backlash.
Fig. 1.3.11(c)
On the other hand, some machine has the characteristic that, torsion
between motor and machine is generated gradually after the change of
direction (Fig.1.3.11(d)). In this case, when current backlash
compensation is applied, compensation will be too much just after
reverse of direction.
Fig. 1.3.11(d)
In this case, when we apply current backlash compensation,
compensation becomes too much just after the direction change. With
circular cutting, cutting path will be shown in Fig.1.3.11(e).
Motor Position
Machine Position
Backlash
Motor Position
Machine Position